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May and Prince William paid tribute to the bravery of troops who fought in the Battle of Amiens at the event, which was staged exactly 100 years since the start of the offensive.

However, while greeting the Duke of Cambridge at the event the PM nearly scraped a knee on the paving as she lunged deeply, in a painful-looking maneouvre, which led to Twitter users to call for a whip-round to raise cash so she can be taught to do the gesture with more grace.

But, as the following photographs show, it is not the first time May has struggled while performing a curtsy for him and other royals.

Queen Elizabeth II welcomes Theresa May at the start of an audience where she invited the former Home Secretary to become Prime Minister and form a new government. Photo / Getty Images